C program to find the sum of n natural numbers using the formula and a for loop.
First n natural numbers are 1, 2, 3, ...,n. The numbers form an arithmetic progression (AP) with one as the first term as well as the common difference.
Sum of first n natural numbers = n*(n+1)/2.
C program to find the maximum and minimum number in an array. A user will input the array and we'll find the largest and the smallest number in the array.
C program to check if an array is sorted or not, i.e., in ascending order or descending order. Variables "a" and "d" in the program are for ascending and descending respectively and are initialized to one. If anyone of its element is greater than the next one, then it isn't in ascending order (a = 0). If anyone of its element is less than the next one, then it isn't in descending order (d = 0). We check the conditions for all consecutive elements of the array. If both the conditions are TRUE, then it isn't sorted. If anyone of them is FALSE, then it's sorted.
C program to find the largest of three numbers: User will input three integers and the program will find the largest of them. If all the numbers are the same then the numbers are not distinct is printed. Note that '&' is the address of operator and '&&' is the logical AND operator.
We can use inbuilt data types to compare two integers that fit in the range of the respective data type. As you know there is a limit of maximum integer which can be stored in a data type. We will use strings to store integers and then create a function to compare the integers. An integer can be positive, zero or negative, we will take care of it in our program.
Linked lists are useful data structures and offer many advantages. A new element can be inserted at the beginning or at the end in constant time (in doubly linked lists). Memory utilization is efficient as it's allocated when we add new elements to a list and list size can increase/decrease as required. They are useful when the size of a list is unknown and changes frequently. It uses a node that stores data and a pointer to the next node.
C program to check Subsequence; don't confuse it with substring. In our program, we check if a string is a subsequence of another.
C program to convert string to integer: It is frequently required to convert a string to an integer in applications. String should consists of digits only and an optional '-' (minus) sign at beginning for integers. For string containing other characters we can stop conversion as soon as a non digit character is encountered but in our program we will handle ideal case when only valid characters are present in string. Library function atoi can be used to convert string to an integer but we will create our own function.
C program to find HCF and LCM: The code below finds the highest common factor and the least common multiple of two integers. HCF is also known as the greatest common divisor (GCD) or the greatest common factor (GCF).
C program to merge two arrays into third array: Arrays are assumed to be sorted in ascending order. You enter two short sorted arrays and combine them to get a large array.
void merge(int [], int, int [], int, int []);
int main() {
int a[100], b[100], m, n, c, sorted[200];
printf("Input number of elements in first array\n");
scanf("%d", &m);
printf("Input %d integers\n", m);
for (c = 0; c < m; c++) {
scanf("%d", &a[c]);
}
